diff --git a/include/sta/Machine.hh b/include/sta/Machine.hh
index a12cd5d4..5b826432 100644
--- a/include/sta/Machine.hh
+++ b/include/sta/Machine.hh
@@ -50,12 +50,12 @@
   #define va_copy(d,s) ((d)=(s))
   #define strcasecmp _stricmp
   #define strncasecmp strncmp
-  #define strtof(nptr,endptr) static_cast<float>(strtod(nptr,endptr))
   #define strtoull _strtoui64
   // Flex doesn't check for unistd.h.
   #define YY_NO_UNISTD_H
   namespace sta {
     int vsnprint(char *str, size_t size, const char *fmt, va_list args);
+    int vasprintf(char **str, const char *fmt, va_list args);
   }
 #else
   #define vsnprint vsnprintf
@@ -89,4 +89,3 @@ size_t
 memoryUsage();
 
 } // namespace sta
-
diff --git a/include/sta/Report.hh b/include/sta/Report.hh
index ac30fcab..10b8d0c3 100644
--- a/include/sta/Report.hh
+++ b/include/sta/Report.hh
@@ -20,6 +20,7 @@
 #include <stdarg.h>
 #include <string>
 #include <mutex>
+#include "Machine.hh" // __attribute__
 #include "DisallowCopyAssign.hh"
 
 struct Tcl_Interp;
diff --git a/include/sta/StringUtil.hh b/include/sta/StringUtil.hh
index 361a551c..7b3f0f32 100644
--- a/include/sta/StringUtil.hh
+++ b/include/sta/StringUtil.hh
@@ -19,6 +19,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <string>
+#include "Machine.hh" // __attribute__
 #include "Vector.hh"
 
 namespace sta {
diff --git a/util/MachineWin32.cc b/util/MachineWin32.cc
index 59234381..a3019606 100644
--- a/util/MachineWin32.cc
+++ b/util/MachineWin32.cc
@@ -1,18 +1,10 @@
-// OpenSTA, Static Timing Analyzer
+// Parallax Static Timing Analyzer
 // Copyright (c) 2021, Parallax Software, Inc.
+// All rights reserved.
 // 
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-// 
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-// 
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+// No part of this document may be copied, transmitted or
+// disclosed in any form or fashion without the express
+// written consent of Parallax Software, Inc.
 
 #include "Machine.hh"
 
@@ -44,6 +36,25 @@ vsnprint(char *str, size_t size, const char *fmt, va_list args)
   return length;
 }
 
+int
+vasprintf(char **str, const char *fmt, va_list args)
+{
+  size_t size = 1024;
+  for (;;) {
+    size *= 2;
+    char *buffer = new char[size];
+    // Copy args before using them because consumption is destructive.
+    va_list args_copy2;
+    va_copy(args_copy2, args);
+    int length = vsnprintf(buffer, size, fmt, args_copy2);
+    if (length >= 0) {
+      *str = buffer;
+      return length;
+    }
+    delete[] buffer;
+  }
+}
+
 int
 processorCount()
 {